Geo_Report_9.3.13.pdfCity of Edmonds
Development Services
121 5"' Avenue North
Edmonds, WA 98020
Subject: Final Geotechnical Inspections Fetter
1611672 d Ave
Attention: Linda Thornquist
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September 3, 2013
TGG Project 1680-3
The Galli Group performed geotechnical special inspections for the above referenced project. The project
consisted of integrating existing patios and decks together into a new deck. The deck was supported on
pipe piles and had a solid surface that directed water to a new drainage system at the deck edge. The
project also included replanting the vegetated buffer with native plants.
Our project recommendations for the deck improvements were provided in a letter dated September 10,
2012. Our assessment of the buffer restoration was provided in a letter dated February 15, 2013. The
buffer restoration plan was prepared by Tom Zachary Landscape Architects, and dated January 24, 2013.
Our observations included the following:
1. On June 19, 2013 we monitored the installation of the pipe piles on the outboard deck
foundations (see attached field report. All piles were driven to nominal refusal according to our
recommendations and all new deck footings within 25 feet of the slope were supported on pipe
piles.
2. The drainage system was checked and repaired during construction. Runoff from impervious
areas including the new deck surface is directed to the existing downspout collection system and
from there to the existing storm drain. The drain was inspected by The Galli Group prior to
completion of the project.
5034 — 18"' Avenue NE, Seattle, WA 98105 Phone: 206.525.5097 Fax: 206.525.5091
16116-72 nd Ave
Edmonds, WA
BLD 2012-0833
3. The buffer enhancement appeared to be installed in general accordance with the approved
landscape plan (although checking the individual plant type is outside our expertise). The soil
had been amended and mulched as directed in our geotechnical report.
4. We checked the area outside the buffer where pavers were installed and observed that water
sprinkled on the surface tends to migrate back toward the deck and catchment system and does
not pond, but infiltrates between the pavers as intended in the plan. After a weekend rain
consisting of more than 3 inches of rain, the site showed no evidence of surface water forming
rills or flowing toward the face of the slope. We noted that the plants are not well established and
that it might take a season or two to establish the plants in the buffer. Some plants might need to
be replaced if they don't survive. The owner appears to be quite vigilant in maintenance of the
planting and vegetation on the site and on or near the slope.
The improvements appeared to be constructed in general accordance with our recommendations and the
approved planting plan. At the time of out- last site visit the site appeared stabilized against future
erosion.
Sincerely,
Paul L. Stoltenberg, P.E.
Project Geotechnical Engineer
10-4-2013
Final Inspection Letter 10032013.cioc 2 The Galli Group
M4DGeotechnical Consulting
503418th Ave NE
Seattle, WA 98105
PROJECT / /l: "�Z A�6 JOB NO. -e
BUILDING PERMIT OR JOB NO. *' 2e)"— r Z - 6 DATE
FIELD REPRESENTATIVE
CLIENT/OWNER
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CONSTRUCTION OPERATIONS
OBSERVATION NOTES:
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